“delivered” to wrong address now I don’t have my package and can’t get a refund .

A week ago a FedEx delivery driver “ delivered “ my package to some place other than mine ( I live in the city/downtown not two houses on a country road ). The delivery confirmation photo looks like it’s inside someone else’s house ( tile floor , base boards ) . I’ve contacted FedEx multiple times but each time they say that the driver marked it delivered and then they close the case . I’ve spent hours in the phone and opened at least 3-4 case with them but they keep rejecting it . Certainly someone else has had this issue , please help .